function setCookie(c_name,value,expiredays)
{
    var exdate=new Date()
    exdate.setDate(exdate.getDate()+expiredays)
    document.cookie=c_name+ "=" +escape(value)+
    ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
}

function getCookie(c_name)
{
	if (document.cookie.length>0)
	  {
	  c_start=document.cookie.indexOf(c_name + "=")
	  if (c_start!=-1)
	    { 
	    c_start=c_start + c_name.length+1 
	    c_end=document.cookie.indexOf(";",c_start)
	    if (c_end==-1) c_end=document.cookie.length
	    return unescape(document.cookie.substring(c_start,c_end))
	    } 
	  }
	return ""
}

function getQueryString(name) {
	var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i');
	var r = window.location.search.substr(1).match(reg);
	if (r != null) {
			return unescape(r[2]);
	}
	return null;
};